SEBS/h-SiO_(2)复合涂层疏水性能研究

Study on Hydrophobicity of SEBS/h-SiO_(2) Composite Coating

目的在飞机常用材料AMS 4037铝合金表面制备超疏水复合涂层,并研究其疏水性,以避免液滴在飞机表面停留,减少结冰,保证飞机在冰雪天气中安全航行。方法以苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)、疏水二氧化硅(h-SiO_(2))为原料,通过提拉法在铝合金表面制备SEBS/h-SiO_(2)超疏水复合涂层。借助扫描电子显微镜、红外光谱仪、接触角测定仪、激光共聚焦显微镜对涂层的显微结构、官能团、粗糙度、接触角进行表征。结果当SEBS与h-SiO_(2)质量比为1∶3时,涂层表面粗糙度为1.11μm,涂层疏水性能达到最佳,与水的静态接触角大于160°滚动角小于1°。涂层表面分布着许多尺寸为10μm的微/纳双重结构。通过Cassie模型分析得出,涂层水接触面积为12%,截留88%的空气。稳定性测试显示,涂层在水中持续浸泡120 min,依然能保持良好的疏水性。结论SEBS/h-SiO_(2)复合涂层具有二元微/纳米粗糙结构和低表面能,当液滴接触时,形成气垫,从而呈现优异的疏水性能。同时,该涂层表现出良好的稳定性和类似荷叶的自清洁能力。

In order to avoid the droplets staying and freezing on the surface of aircraft,and ensure the safe flight of aircraft in ice and snow weather,the superhydrophobic composite coating was prepared on the surface of AMS 4037 aluminum alloy,and its hydrophobicity was studied.Using styrene-ethylene-butylene-styrene block copolymer(SEBS)and hydrophobic silica(h-SiO_(2))as raw materials,SEBS/h-SiO_(2) superhydrophobic composite coating was prepared on aluminum alloy by dip-coating method.The microstructure,functional group,roughness and contact angle of the coating were characterized by scanning electron microscope,infrared spectrometer,laser confocal microscopy and contact angle tester.When the mass ratio of SEBS to h-SiO_(2) is 1∶3,the surface roughness of the coating is 1.11μm,and the hydrophobicity of the coating is best,in which the static contact angle with water is more than 160°,and the rolling angle is less than 1°.Many micro/nanostructure with a size of 10μm is distributed on the coating surface.According to Cassie model analysis,the water contact area of the coating is 12%,and 88%of the air is trapped.Through the stability test,the high hydrophobicity can be maintained within 120 min after continuous immersion in water.The SEBS/h-SiO_(2) composite coating has a binary micro/nano rough structure,along with the low surface energy of SEBS and h-SiO_(2).The air cushion is formed when the droplets are contacted with coating,resulting in excellent superhydrophobic properties.At the same time,the coating shows good stability and self-cleaning ability similar to a lotus leaf.